Using propane heater exhaust as a outside heat source?

Besides the obvious fact of the possibility of killing your family. The smell of the exhaust from the furnace and hot water heats smells.

I can't even leave my kitchen window open when the hwh is on because of the smell of the exhaust coming up thru the window into the coach.

Pipe that under the entire belly of your MH and it's going to stink up the entire coach to high heaven before it ultimately does kill someone. :R